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Wiggling robots reveal the physics of how Hula-Hoops stay up
- Scientists have used spinning, hoop-slinging robots to study the physics of Hula-Hoops.
- Robots with indented middles shaped like an hourglass were the only ones able to keep the hoop up.
- The slope at the bottom of the indent provided an upward force, countering gravity.
- The new findings offer tips for people learning to hula-hoop, such as launching the hoop fast and positioning it correctly.
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